Content deleted Content added
→top: Clean up/copyedit |
m →MSTP Bridge Protocol Data Units (BPDU): clean up spacing around commas and other punctuation fixes, replaced: ,2004 → , 2004 |
||
Line 47:
=== MSTP Bridge Protocol Data Units (BPDU) ===
{{Main article|Bridge Protocol Data Unit}}
Its main function is enabling MSTP to select its root bridges for the proper CIST and each MSTI. MSTP includes all its spanning tree information in a single BPDU format. Not only does reduce the number of BPDUs required on a LANs to communicate spanning tree information for each VLAN, but it also ensures backward compatibility with RSTP (and in effect, classic STP too).
BPDUs' general format comprises a common generic portion ''-octets 1 to 36-'' that are based on those defined in IEEE Standard [[IEEE 802.1D|802.1D]], 2004,<ref>{{cite book|last = IEEE|first = Standard|title = IEEE Standard for Local and metropolitan area networks, Media Access Control (MAC) Bridges|publisher = IEEE Computer Society
|year = 2004|url = http://www.ccna-powertraining.de/wp-content/uploads/2014/10/802.1D-2004.pdf}}</ref> followed by components that are specific to CIST ''-octets 37 to 102.'' Components specific to each MSTI are added to this BPDUs data block.
| |||